Chain saw



Aug. 17, 1948.

R. C. WHITLOCK CHAIN SAW Filed sept, '14, 1944 IN V EN TOR. Raymond 6. W/w'/ock ATTORTVE Y Patented ug. 17, 1948 f, UNITED STATES PATENT OFFICE j fanmgs'f k" CHAIN SAW Y Raymond C. Whitlock, San Francisco Calif. Application September 14, 1944, Serial No. 553,965

This invention relates to improvements in saws and has particular reference to the construction of a chain saw, wherein an unique arrangement of replaceable cutting blades is employed vto readily accomplish varying degreesof thickness in cuts in the felling of trees and like articles to be sawed. v

`A further object of the invention is the provision of novel motor driven means for effectively 'actuating the saw and thus providing an efficient la-bor saving apparatus that will accomplish the cutting operation in a minimum amount of time.

An additional object of the invention is the provision of pressure plates associated with the driving motor, wherebydanger of slippageof the saw will be eliminated when the cutting operation is being performed and which pressure plates function to direct the saw to its cutting position.

A further object of the invention is the provision of tensioning means in the form of a cable which has associated therewith turn-buckles to take up slack in the body of the saw.

An additional object of the invention is the provision of a chain saw of the character described that is positive in operation, economical to manufacture, strong and durable.

Other objects and advantages will be apparent during the course of the following description,

In the accompanying drawings wherein for the purpose of illustration is shown the preferred embodiment of the invention,

Fig. 1 is a top plan view of the chain saw constructed in accordance with my invention,

Fig. 2 is a side elevational view and partly in section, on an enlarged scale of the motor, the

bracket supported by the motor and likewise i-llustrating the segmental pressure plates and associated mechanism for eliminating danger of slippage of the saw teeth, the view being taken on the line 2-2 of Fig. 1,

Fig. 3 is a transverse sectional view through the casing disclosing the grooved pulley and associated mechanism, the View being taken on the line 3-3 of Fig. l,

Fig. 4 is a fragmentary top plan view of the saw blades,

Fig. 5 is a front elevation of the same, and

Fig. 6 is a vertical section through the blades and mounting thereof, the View being taken on the line 6-6 of Fig. 5.

In the accompanying drawing the numeral 1 indicates a semi-circular shield or casing that is secured as at 8 to the body 9. This shield is grasped by the operator in manipulating the saw. To said body apertured lugs I0 and II are secured 1 claim. (ci. 14a-aa) that receive therein a pin I2 on which rollers I3, positioned between spacers I'4, rotate. As dis-- closed to advantage in Fig. 3 it will be noted that the inner edge of the chain saw, indicated asa whole by the reference character A, passes freely over the outer peripheries of the rollers I3. The said spacers serve to guide the chain sawfin its continuous endles'smovement and likewise function to retain said rollers therebetween for freef ldom of rotary movement on the pinsv I2.

Supported on the respective ends B land'C of the shields is the medium for'driving the chain sawfwhich medium comprisesanair motor I4. It is obvious that one or two motors may be employed and'since'thesaid motor and associated mechanisms are similar in construction, but one motor and one distinctive mechanism will be described. l

The preferred motor utilized is of the air type, as stated, and is employed because of its lightness in weight and its effectiveness in driving the chain saw. A band I5 encircles and is secured to the motor housing and has suitably connected thereto a bracket I6 equipped with an arm I1 on which is suspended a stationary yoke I8 that has rotatably mounted thereon a roller I9 in frictional contact with one of a plurality of segmental pressure plates 20. The nature and construction and the preferred number of said plates are disclosed to advantage in Fig. 1 and on an enlarged scale in Fig. 2 of the drawing.

It will 'be noted Ias illustrated that the motor shaft 2| of the motor I4 has keyed thereto for rotation with said shaft, a circular plate or disc 22 that is reduced in thickness adjacent its marginal edges. The upper end of the shaft is threaded to receive thereon the internal threads of an enlarged hexagonal nut 23 to the faces of which are secured lugs 24 to which the said pressure plates are pivoted as at 25. Tension springs 26 are interposed between the lower faces of said pressure plates and the reduced body of the disc 22 which reduced'body is preferably insulated to eliminate `excessive wear thereon. Likewise lock nuts 28 are employed to obtain a proper tensioning of the springs, and after the pressure point is passed the spring frees the pressure plate from the chain saw. It will be obvious that as each segmental pressure plate passes beneath the roller I8 in the course of travel of the chain saw, pressure will be exerted on the contacted saw blade or mounting thereof, while the remaining pressure plates will assume the normal position illustrated in Fig. 2 on the right hand side of said figure.

A cable 30, equipped with turn-buckles 3|, is secured to the end of the frame adjacent the motor housing. By manipulating the turnbuckles any slack in the frame can be compensated for, The cable is retained in position by contact With staggered lugs carried by the frame.

The chain saW per se consists of a plurality of interconnected blade mountings 32 and 33. The mounting 33 has riveted or otherwise secured between xthe side Walls thereof the `preferred*type olf cutter blade 35 I {propose to employ that Will most effectively perform the cutting or sawing operation. The mounting 32 has associated therewith pairs of cleanout or drag bladesv 8l that function to remove accumulated matter from the cut. The respective are pivoted one to the other and asteel .bear-ing 36 is employed at the pivotal point It'o provide a sturdy construction. It is obvious that Varying types of blades may be utilized and in .the present invention these blades may be `conveniently replaced after the desired usage of the same.

From the :foregoing `description considered in connection with -the `aocorn-panying rdrawings it J@vill be obvious that -I have iproduced, .af-.most eiliei-ent chain saw and driving mechanism therefor that will be -eifecti-ve in a great saving of labor in `producing :the desired results.

I-t is lto be understood that :the form of the invention vherewith shown and `described is to be taken as aprefer-red example of the'same and that Variouschang-es relative to fthe shape, size, materiaLand arrangement of parts may be fresorted to Without departing from the ispi-rit of the :invention or -the scope of 4the subjoined claim.` v v rvI-Iavi-ng V.thus rdescribed my invention, I claim:

In a saw apparatus, a, shield, an endless cutsaid turntables, said means for securing said `'pressure plates to said shafts comprising a nut threadedly engaging the upper end of each of 'saidsh'a'ts and 'a lug formed on each face of Yeffen k01E-said nuts :forming a pivotal mounting for each of said pressure plates.

RAYMOND C. WHITLOCK.

REFERENCES vCITED v 'The following references are "of 'record zin 'the le of this patent:

UNITED lSTATES PATENTS umber 'Name Date 305,931 Kitson Sept, 30., V'18821 532,349 Watts Jan, `8, 1895 834,251 Bailey Oct. '30, 1906 945,599 'Purser Jan. 4, '1910 '10614702 A'.'["a`,g 3,a1t May 13, 1913 "LT-95,945. 'Mitchell et al. Allg. 22, u1.916 1,276,579 'Sc'ot't Aug. '20, l1'918 "1,584,630 .Meighan May 1'1, A1926 v'114617,565 Be'ns Febt 15, `1927 "1,663,154 Bissiett 1Mar, 20, 1-928 

